The emerging strategy to overcome the limitations of bulk quantum optics consists of taking advantage of the robustness and compactness achievable by integrated waveguide technology. Here we report the realization of a directional coupler, fabricated by femtosecond laser waveguide writing, acting as an integrated beam splitter able to support polarization-encoded qubits. This maskless and single step technique allows us to realize circular transverse waveguide profiles which are able to support the propagation of Gaussian modes with any polarization state. Using this device, we demonstrate quantum interference with polarization-entangled states and singlet state projection. © 2010 The American Physical Society.
Polarization entangled state measurement on a chip / Sansoni, Linda; Sciarrino, Fabio; Vallone, Giuseppe; Mataloni, Paolo; Andrea, Crespi; Roberta, Ramponi; Roberto, Osellame. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 105:20(2010). [10.1103/physrevlett.105.200503]
Polarization entangled state measurement on a chip
SANSONI, LINDA;SCIARRINO, Fabio;VALLONE, GIUSEPPE;MATALONI, Paolo;
2010
Abstract
The emerging strategy to overcome the limitations of bulk quantum optics consists of taking advantage of the robustness and compactness achievable by integrated waveguide technology. Here we report the realization of a directional coupler, fabricated by femtosecond laser waveguide writing, acting as an integrated beam splitter able to support polarization-encoded qubits. This maskless and single step technique allows us to realize circular transverse waveguide profiles which are able to support the propagation of Gaussian modes with any polarization state. Using this device, we demonstrate quantum interference with polarization-entangled states and singlet state projection. © 2010 The American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
